What is an Air Conditioner Coil?


  July 2nd 2020            👤   Aircon Heroes Team

Air conditioner coils are an essential component that help to cool your indoor environment. The entire air conditioning process depends on these coils and without them it is impossible to operate an aircon. Understanding the types of coils and how they work can help you as part of your preparation for aircon maintenance.

Since the air conditioner coils are essential to your aircon’s performance, you should keep the coils clean and in proper working condition. Apart from regular DIY cleaning, you should occasionally call a professional aircon servicing provider to check for any defects in the coils.

There are two different air coils used inside an air conditioner. One of them is installed inside the indoor unit and the other one is placed inside the outdoor unit. 

How Does An Air Conditioner Coil Work?

The coil installed inside the indoor unit is also called the evaporator coil. On the other hand, the air conditioning coil present inside the outdoor unit is called the condenser coil. Each of these coils is dependent on the other to regulate the heat flow across the room.

A complete air conditioning cycle is dependent on both coils. In the first half cycle, the evaporator coil inside the indoor unit extracts the heat of the room. For this purpose, the low-temperature liquid refrigerant is brought into the evaporator coil with the help of the compressor. 

As the refrigerant moves towards the evaporator coil, it is allowed to pass through an expansion valve. This sudden expansion results in pressure drop and the liquid refrigerant faces quick cooling in the coil. The temperature of the refrigerant is cold enough to attract the heat from inside the room.

A blower fan is also installed inside the indoor unit which facilitates the refrigerant to attract more heat from the outside environment. Once the heat reaches the evaporator coil, it changes the state of the liquid refrigerant and it turns into hot vapour. These vapours of refrigerant then move towards the outdoor unit. 

Inside the outdoor unit, there is another expansion valve and a condenser coil installed in it. When the refrigerant changes its state from liquid to gas, it reaches the outdoor unit through a copper piping channel. There is a compressor installed in the outdoor unit. This compressor applies pressure to the incoming refrigerant gas. After getting compressed, the refrigerant is passed through the condenser coils. At this position, the refrigerant gas loses a lot of heat taken from the indoor unit. There is a complete channel of condenser coils in the outdoor unit. This lengthy channel provides enough time to the refrigerant gas so it can easily get cooled. 

Once the temperature of the refrigerant is reduced, it changes its state and becomes liquid refrigerant again, which then moves back to the indoor unit. This completes one air-conditioning cycle.

How to Take Care of an Air Conditioning Coil?

An air conditioning coil has to be handled with care. Initially, during installation, these coils are placed in such a manner that they can be protected from the outside harsh climate conditions. During their life cycle, sometimes the air-conditioning coils face freezing effects. Sometimes the water vapour starts freezing over the evaporator coils. The piping system and gas pressure also affects the performance and efficiency of these coils. 

If the pipe connecting the indoor and outdoor units is quite long, the gas pressure has to be maintained across the pipe accordingly, so the performance of the unit doesn’t get disturbed.

If there is any leakage inside the pipe, it will damage the efficiency of these coils. A professional aircon servicing provider can inspect the unit for any defects in the coils to find any leakage in the piping systems. 

Both the evaporator coil and condenser coil require routine maintenance and cleaning. Since the condenser coil is mounted inside the outdoor unit, it requires more care than the evaporator coil. Prolonged exposure to dust particles and debris from the open air outside can contaminate the coil and can affect the efficiency of the unit.

Cleaning the coils once a month can remove any buildup of dust and dirt particles from the evaporator and condenser coils. In this way, they are kept in tip top condition and can maximise the cooling efficiency of your aircon. You should also get these coils serviced by a professional technician once every few months. This prevents higher energy consumption and lower cooling performance.

Your air conditioner works efficiently only if all of its components are in optimal condition. A little care and routine maintenance can increase the lifetime of an air conditioner by years. That is why you should not forget the maintenance and service of the fan coils in both the outdoor and indoor units of your air conditioner.


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